\begin{table}
	\centering
	\vspace{1ex}
	\begin{tabular}{|c| p{0.4 cm}| p{0.4 cm}| p{0.4cm}| c | c | c |}
		\hline
		\multirow{3}{*}{
			\parbox[c]{.2\linewidth}{\centering Voltage vectors}}
		   & \multicolumn{3}{l|}{Switching vectors }
		   & \multicolumn{3}{c|}{Output voltage} \bigstrut                                    \\ \cline{2-7}
		   & a & b & c                                     & Va      & Vb      & Vc \bigstrut \\ \hline
		\rule{0pt}{4ex}
		V0 & 0 & 0 & 0                                     & 0       & 0       & 0            \\ \hline
		\rule{0pt}{4ex}
		V1 & 1 & 0 & 0                                     & 2Udc/3  & -Udc/3  & -Udc/3       \\ \hline
		\rule{0pt}{4ex}
		V2 & 1 & 1 & 0                                     & Udc/3   & Udc/3   & -2Udc/3      \\ \hline
		\rule{0pt}{4ex}
		V3 & 0 & 1 & 0                                     & -Udc/3  & 2Udc/3  & -Udc/3       \\ \hline
		\rule{0pt}{4ex}
		V4 & 0 & 1 & 1                                     & -2Udc/3 & Udc/3   & Udc/3        \\ \hline
		\rule{0pt}{4ex}
		V5 & 0 & 0 & 1                                     & -Udc/3  & -Udc/3  & 2Udc/3       \\ \hline
		\rule{0pt}{4ex}
		V6 & 1 & 0 & 1                                     & Udc/3   & -2Udc/3 & Udc/3        \\ \hline
		\rule{0pt}{4ex}
		V7 & 1 & 1 & 1                                     & 0       & 0       & 0            \\ \hline
	\end{tabular}
\end{table}
